Per my comment above I have a prototype of this feature up at https://github.com/chiaracoetzee/fluxer-subprofiles/tree/features/subprofiles based on @haileyscommit's design and it's working well on our home server. It's web/desktop client only not mobile right now. Would need a lot more prep before submitting a proper PR. Supports both GUI subprofile selection and PluralKit-style prefixes, and can import a system from a PluralKit JSON export dump. Tested with a large imported system with 60+ members. Some screenshots below for reference.
imageimageimage
implicit conversion can still be done. i do think "not sounding too plural-coded" is a valid concern though. while pluralkit and tupperbox are the de facto standards, i dont think that justifies an Import from PluralKit / Tupperbox button
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